- Volume 4 Issue 2
As the Internet Protocol be widely/rapidly used in packet communication, common carriers are providing the multimedia service(Both direction real-time voice, video conference, remote educational etc.)on the Internet. Also the 070 VoIP (Voice over IP) service is provided by the carriers on the packer network. In order to offer VoIP service in Korea, common carrier has to acquire the optimum level for QoS(quality of service). In this paper, we study on CODEC quality to get a higher QoS for VoIP.
- ITU-T P.833, "Methodology for derivation of equipment factors from subjective listening- only tests", Feb. 2001.
- TTA 표준(TTAS.ET-101329-2), 인터넷 전화 VoIP QoS Class 모델, Dec. 2003.
- ITU-T Recommendation G.726(12/90), "40,32, 24,16 Kbit/s Adaptive Differential Pulse code Modulation (ADPCM)".
- ITU-T Recommendation P.310(02/96), "Transmission characteristics for telephone-band(300`3400Hz)digital telephones".
- ITU-T Recommendation G.177, "Transmission planning for voice-band services over hybrid Internet/PSTN connections".
- ITU-T Recommendation G.107(05/00), "The E-Model, a computational model for use in transmission planning".
- TTA 표준(TTAS.ET-101329-5), 인터넷 전화 QoS 품질측정, Dec. 2003.
- ITU-T p.834, "Methodology for derivation of equipment impairment factors from instrumental models", July 2002.
- ITU-T Recommendation G.109(09/00), "Definition of categories of speech transmission quality".
- ITU-T Recommendation G.711(11/88), "Pulse code modulation of voice frequencies".
- TTA 표준(TTAS.KO-01.0077), 인터넷 전화 통화 품질 지표, Dec. 2005.
- ETSI TR 101 329-01, "Telecommunication and Internet Protocol Harmonization over Networks( TIPHON) Release 3; End to End Quality of Service in TIPHON systems; Part 1: General aspects of Quality of Service (QoS)".
- ITU-T Recommendation E.721(05/99), "Network grade of service parameters and target values for circuit-switched services in the evolving ISDN".
- ITU-T Recommendation P.800, "Methods for subjective determination of transmission quality".